热处理对碳/碳复合材料上碱液处理氧化钛镀层诱导沉积磷灰石和结合强度的影响

Effect of Heat Treatment on Induced Apatite Deposition and Bonding Strength of the Alkali Treated Titanium Oxide Layer for Carbon/Carbon Composite

碳/碳复合材料具有良好的力学性能和生物相容性,但没有生物活性。采用离子束增强沉积技术在碳/碳复合材料上制备了氧化钛膜层,并进行了碱液处理、真空热处理、模拟体液浸泡和划痕试验。研究发现氧化钛膜层经过碱液处理形成的多孔网状钛酸钠凝胶层,可在模拟体液中诱导沉积出生物活性磷灰石层。钛酸钠凝胶层经过热处理变得致密,诱导沉积磷灰石层的速度有所下降。划痕试验表明碱液处理氧化钛镀层的结合强度在热处理后略有提高,但膜层的结合性能受到碳/碳复合材料较软的限制。

Carbon/carbon composite has good mechanical properties and biocompatibility, but has no bioactivity. Titanium oxide film was deposited onto the carbon-carbon composite using ion beam enhanced deposition, then subjected to alkali treatment, heat treatment in vacuum, immersion in the simulated body fluid (SBF) and scratch test. It was found that a porous network of sodium titanate gel was formed after the titanium oxide film was alkali treated, and the gel layer could induce deposition of bioactive apatite layer in SBF. The porous gel layer became denser and the apatite deposition rate was decreased after heat treatment. The scratch test showed that the bonding strength of the alkali treated titanium oxide film was slightly increased after heat treatment, but bonding strength of the films was limited by the soft carbon/carbon composite substrate.